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    <title>55 · agency — Blog</title>
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    <description>Mobile, web and AI: field notes from the 55 · agency studio.</description>
    <language>en-US</language>
    <lastBuildDate>Tue, 29 Sep 2026 09:00:00 GMT</lastBuildDate>
    <item>
      <title>Freelancer, no-code or agency: who should build your app?</title>
      <link>https://www.55.agency/en/blog/freelancer-no-code-or-agency.html</link>
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      <pubDate>Tue, 29 Sep 2026 09:00:00 GMT</pubDate>
      <category>Business</category>
      <description>Freelancer, no-code or agency to build your app: a comparison of costs, risks and lead times, and when each option is the right one.</description>
    </item>
    <item>
      <title>Choosing a mobile app agency: criteria, questions and pitfalls</title>
      <link>https://www.55.agency/en/blog/how-to-choose-a-mobile-app-agency.html</link>
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      <pubDate>Sat, 26 Sep 2026 09:00:00 GMT</pubDate>
      <category>Business</category>
      <description>Criteria, questions to ask and pitfalls to avoid (code, store accounts, fixed price or T&amp;M) when choosing the agency that will build your mobile app.</description>
    </item>
    <item>
      <title>Gym or coach app: booking, memberships, programmes and app store commissions</title>
      <link>https://www.55.agency/en/blog/gym-fitness-coach-app.html</link>
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      <pubDate>Fri, 25 Sep 2026 09:00:00 GMT</pubDate>
      <category>Mobile</category>
      <description>Class booking, memberships, programmes, wearables, payment: what a gym or coach app involves, and when Apple takes 15 or 30%.</description>
    </item>
    <item>
      <title>E-commerce app or mobile website: when a native app really earns more</title>
      <link>https://www.55.agency/en/blog/ecommerce-app-or-mobile-website.html</link>
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      <pubDate>Thu, 24 Sep 2026 09:00:00 GMT</pubDate>
      <category>Business</category>
      <description>Native app, PWA or mobile site for selling online? Real costs, push notifications, loyalty and the threshold at which an app becomes profitable.</description>
    </item>
    <item>
      <title>Offline app for field teams: synchronisation, conflicts, photos, signatures and ERP</title>
      <link>https://www.55.agency/en/blog/offline-field-service-app.html</link>
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      <pubDate>Wed, 23 Sep 2026 09:00:00 GMT</pubDate>
      <category>Mobile</category>
      <description>Construction, maintenance: how to design a business app that works without a network. Sync, conflicts, photos, signatures, ERP and a realistic budget.</description>
    </item>
    <item>
      <title>Building a marketplace in 2026: model, payments, KYC and MVP budget</title>
      <link>https://www.55.agency/en/blog/how-to-build-a-marketplace.html</link>
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      <pubDate>Tue, 22 Sep 2026 09:00:00 GMT</pubDate>
      <category>Business</category>
      <description>Business model, Stripe Connect or Mangopay payments, KYC, the chicken-and-egg problem, MVP budget: a practical guide to launching a marketplace in 2026.</description>
    </item>
    <item>
      <title>Health apps: how HDS, GDPR and medical device rules change your project</title>
      <link>https://www.55.agency/en/blog/health-app-hds-gdpr.html</link>
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      <pubDate>Sat, 19 Sep 2026 09:00:00 GMT</pubDate>
      <category>Tech</category>
      <description>HDS hosting, GDPR health data, the wellness / medical device line: what each framework requires and its real impact on your budget and timeline.</description>
    </item>
    <item>
      <title>Building a real estate app: features, integrations and budget</title>
      <link>https://www.55.agency/en/blog/real-estate-app-development.html</link>
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      <pubDate>Fri, 18 Sep 2026 09:00:00 GMT</pubDate>
      <category>Mobile</category>
      <description>Agency, property management or developer: the useful features, integration with portals and business software, and the real budget of a real estate app.</description>
    </item>
    <item>
      <title>Hotel mobile app: winning direct bookings back from the OTAs</title>
      <link>https://www.55.agency/en/blog/hotel-app-direct-bookings.html</link>
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      <pubDate>Thu, 17 Sep 2026 09:00:00 GMT</pubDate>
      <category>Mobile</category>
      <description>Mobile check-in, digital key, upsell: how a hotel app brings guests back to book direct rather than through OTAs, and what it costs.</description>
    </item>
    <item>
      <title>Restaurant app cost: ordering, click &amp; collect and loyalty</title>
      <link>https://www.55.agency/en/blog/restaurant-app-cost.html</link>
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      <pubDate>Wed, 16 Sep 2026 09:00:00 GMT</pubDate>
      <category>Budget</category>
      <description>How much does a restaurant app cost (ordering, click &amp; collect, loyalty) and when does it pay off against delivery platform commissions?</description>
    </item>
    <item>
      <title>Rebuild your app or fix it? The honest calculation</title>
      <link>https://www.55.agency/en/blog/rebuild-or-fix-your-app.html</link>
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      <pubDate>Wed, 19 Aug 2026 09:00:00 GMT</pubDate>
      <category>Budget</category>
      <description>Rewriting costs 70 to 110% of the original price, repairing 25 to 40%. The decision grid and a costed three-year comparison.</description>
    </item>
    <item>
      <title>AI agents: automating a process without breaking what already works</title>
      <link>https://www.55.agency/en/blog/ai-agents-business-process-automation.html</link>
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      <pubDate>Wed, 12 Aug 2026 09:00:00 GMT</pubDate>
      <category>AI</category>
      <description>What an AI agent can really automate, the five essential safeguards and the gradual rollout method that avoids incidents.</description>
    </item>
    <item>
      <title>How much does a mobile app cost in 2026?</title>
      <link>https://www.55.agency/en/blog/mobile-app-cost-2026.html</link>
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      <pubDate>Thu, 30 Jul 2026 09:00:00 GMT</pubDate>
      <category>Budget</category>
      <description>The real budget for a mobile app, item by item, from MVP to full app: cost breakdown, price drivers and pitfalls to avoid.</description>
    </item>
    <item>
      <title>Mobile CI/CD: shipping every week without breaking production</title>
      <link>https://www.55.agency/en/blog/mobile-ci-cd-weekly-releases.html</link>
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      <pubDate>Wed, 15 Jul 2026 09:00:00 GMT</pubDate>
      <category>Tech</category>
      <description>Why mobile releases are still a manual craft, and the automation chain that lets you ship every week without stress or single-person dependency.</description>
    </item>
    <item>
      <title>How much does a professional website cost in 2026?</title>
      <link>https://www.55.agency/en/blog/website-cost-2026.html</link>
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      <pubDate>Thu, 02 Jul 2026 09:00:00 GMT</pubDate>
      <category>Budget</category>
      <description>From brochure site to e-commerce: the four price tiers, the breakdown by cost item and the annual running costs nobody mentions.</description>
    </item>
    <item>
      <title>Digital accessibility: what the law really requires</title>
      <link>https://www.55.agency/en/blog/digital-accessibility-rgaa.html</link>
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      <pubDate>Tue, 30 Jun 2026 09:00:00 GMT</pubDate>
      <category>Design</category>
      <description>Who is covered in 2026, what the RGAA and European regulation require, and the ten fixes that deliver most of the result.</description>
    </item>
    <item>
      <title>AI API costs: how not to blow up your bill</title>
      <link>https://www.55.agency/en/blog/llm-api-costs.html</link>
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      <pubDate>Wed, 17 Jun 2026 09:00:00 GMT</pubDate>
      <category>AI</category>
      <description>The five mechanisms that make an AI API bill run away, the levers that cut it fivefold, and the safeguards to put in place before production.</description>
    </item>
    <item>
      <title>Funding your app: CIR, CII, JEI and the aid people forget</title>
      <link>https://www.55.agency/en/blog/funding-an-app-in-france.html</link>
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      <pubDate>Wed, 03 Jun 2026 09:00:00 GMT</pubDate>
      <category>Budget</category>
      <description>The schemes that genuinely reduce a digital budget in France: what is eligible, what is not, and the mistakes to avoid when applying.</description>
    </item>
    <item>
      <title>Headless CMS: which one to choose when you are not a technical team</title>
      <link>https://www.55.agency/en/blog/choosing-a-headless-cms.html</link>
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      <pubDate>Wed, 20 May 2026 09:00:00 GMT</pubDate>
      <category>Web</category>
      <description>Real costs, editorial autonomy, migration pitfalls: the criteria that matter, and the cases where a traditional CMS is still the right choice.</description>
    </item>
    <item>
      <title>How much does an artificial intelligence project cost?</title>
      <link>https://www.55.agency/en/blog/ai-project-cost-2026.html</link>
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      <pubDate>Wed, 13 May 2026 09:00:00 GMT</pubDate>
      <category>Budget</category>
      <description>Assistant, automation, business agent: what makes up the real budget of an AI project, the usage share and the profitability calculation.</description>
    </item>
    <item>
      <title>After launch: what maintenance really costs</title>
      <link>https://www.55.agency/en/blog/mobile-app-maintenance-cost.html</link>
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      <pubDate>Wed, 06 May 2026 09:00:00 GMT</pubDate>
      <category>Budget</category>
      <description>What mobile app maintenance covers, why it takes 15 to 20% of the budget each year, and what happens if you skip it.</description>
    </item>
    <item>
      <title>GDPR and mobile apps: compliance in practice</title>
      <link>https://www.55.agency/en/blog/gdpr-mobile-app-compliance.html</link>
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      <pubDate>Wed, 15 Apr 2026 09:00:00 GMT</pubDate>
      <category>Tech</category>
      <description>Consent, third-party SDKs, retention, account deletion: what the GDPR really requires of an app, and the technical checklist before publishing.</description>
    </item>
    <item>
      <title>Mobile onboarding: the screens that decide your retention</title>
      <link>https://www.55.agency/en/blog/mobile-onboarding-retention.html</link>
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      <pubDate>Wed, 01 Apr 2026 09:00:00 GMT</pubDate>
      <category>Design</category>
      <description>40 to 60% of users leave after a single launch. The six onboarding moments that decide your retention, and what you need to measure.</description>
    </item>
    <item>
      <title>Mobile app requirements document: the template we use</title>
      <link>https://www.55.agency/en/blog/mobile-app-requirements-template.html</link>
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      <pubDate>Wed, 18 Mar 2026 09:00:00 GMT</pubDate>
      <category>Business</category>
      <description>A useful requirements document fits in ten pages. The exact structure we ask for and the five mistakes that make quotes balloon.</description>
    </item>
    <item>
      <title>Core Web Vitals: what really matters for SEO</title>
      <link>https://www.55.agency/en/blog/core-web-vitals-2026.html</link>
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      <pubDate>Wed, 04 Mar 2026 09:00:00 GMT</pubDate>
      <category>Web</category>
      <description>LCP, INP, CLS: the thresholds that matter for SEO and the six optimisations that deliver 80% of the gain on a professional website.</description>
    </item>
    <item>
      <title>Fixed price, time and materials or capped budget: which contract for your project</title>
      <link>https://www.55.agency/en/blog/fixed-price-vs-time-and-materials.html</link>
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      <pubDate>Wed, 25 Feb 2026 09:00:00 GMT</pubDate>
      <category>Budget</category>
      <description>The three billing models for a digital project, what each costs, who bears the risk, and how to avoid the spiral of change orders.</description>
    </item>
    <item>
      <title>App Store and Google Play: the 9 rejection reasons we see most</title>
      <link>https://www.55.agency/en/blog/app-store-google-play-rejections.html</link>
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      <pubDate>Wed, 18 Feb 2026 09:00:00 GMT</pubDate>
      <category>Mobile</category>
      <description>The most frequent rejection reasons on the App Store and Google Play, and the pre-submission checklist that saves you two weeks of delay.</description>
    </item>
    <item>
      <title>RAG: building an assistant that really answers from your documents</title>
      <link>https://www.55.agency/en/blog/rag-document-assistant.html</link>
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      <pubDate>Wed, 04 Feb 2026 09:00:00 GMT</pubDate>
      <category>AI</category>
      <description>Why most RAG assistants fail, and the six technical decisions that make the difference between a gimmick and an everyday tool.</description>
    </item>
    <item>
      <title>Which backend architecture when you don’t yet know if you’ll scale</title>
      <link>https://www.55.agency/en/blog/startup-backend-architecture.html</link>
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      <pubDate>Wed, 21 Jan 2026 09:00:00 GMT</pubDate>
      <category>Tech</category>
      <description>Monolith, microservices or serverless: the real criteria for choosing a young app’s backend architecture without punishing yourself 18 months on.</description>
    </item>
    <item>
      <title>MVP: cutting the scope without sabotaging the product</title>
      <link>https://www.55.agency/en/blog/mvp-scope.html</link>
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      <pubDate>Wed, 07 Jan 2026 09:00:00 GMT</pubDate>
      <category>Business</category>
      <description>The method for cutting a scope from 40 features to 6 without killing the product: the single journey and what you should never cut.</description>
    </item>
    <item>
      <title>Hiring a team or using an agency: the real cost</title>
      <link>https://www.55.agency/en/blog/in-house-team-vs-agency-cost.html</link>
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      <pubDate>Wed, 17 Dec 2025 09:00:00 GMT</pubDate>
      <category>Budget</category>
      <description>Fully loaded salary, recruitment, management, idle time: the complete three-year calculation, and the threshold at which in-housing pays off.</description>
    </item>
    <item>
      <title>Design system: when is it really worth it?</title>
      <link>https://www.55.agency/en/blog/when-to-build-a-design-system.html</link>
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      <pubDate>Wed, 10 Dec 2025 09:00:00 GMT</pubDate>
      <category>Design</category>
      <description>A design system is an investment: here are the criteria to know whether yours will pay off, and where to start if the answer is yes.</description>
    </item>
    <item>
      <title>Website redesign: the SEO checklist to avoid losing your traffic</title>
      <link>https://www.55.agency/en/blog/website-redesign-seo-checklist.html</link>
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      <pubDate>Wed, 19 Nov 2025 09:00:00 GMT</pubDate>
      <category>Web</category>
      <description>A poorly prepared redesign costs 40 to 70% of organic traffic. The five phases that win you traffic instead of destroying it.</description>
    </item>
    <item>
      <title>Generative AI in business: where to start without breaking the bank</title>
      <link>https://www.55.agency/en/blog/generative-ai-in-business-where-to-start.html</link>
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      <pubDate>Wed, 22 Oct 2025 09:00:00 GMT</pubDate>
      <category>AI</category>
      <description>A practical method for launching a first useful generative AI project: choose the use case, avoid the pointless POC, measure ROI within 90 days.</description>
    </item>
    <item>
      <title>React Native, Flutter or native: how to decide</title>
      <link>https://www.55.agency/en/blog/react-native-flutter-or-native.html</link>
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      <pubDate>Wed, 01 Oct 2025 09:00:00 GMT</pubDate>
      <category>Mobile</category>
      <description>An honest comparison of React Native, Flutter and native: costs, performance, hiring, maintenance, and our decision tree.</description>
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