Sentinel InstaCheck + vs BoilerFix AI
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
Sentinel InstaCheck +
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Used in conjunction with the InstaCheck water test kit - sold separately - the app guides users through best practice guidelines based on BS7593 standard; It generates a water quality report with tailored recommendations for ongoing system care, according to water test results. InstaCheck allows users to follow UK best practice at install and service visits, ensuring boiler and heat pump installations are protected against corrosion and scaling. Poor water quality and inadequate treatment can result in breakdowns, loss of heating efficiency and excessive fuel consumption; The tests and recommendations in InstaCheck reports are designed to help protect installations from these common problems.
BoilerFix AI
A comprehensive mobile toolkit designed for UK Gas Safe registered heating engineers. It consolidates fault code databases, control guides, AI diagnostics, customer management, and administrative tools into a single, offline-capable application.
- Fault Code Database (12 manufacturers)
- AI Diagnostic Assistant
- Boiler Passport (QR-linked service history)
- Customer Hub & Job Calendar
- CP12 Certificates generation
- Invoicing & Bookkeeping
- Offline functionality
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The toolkit for Gas Safe registered engineers, built by a working Gas Safe engineer. BoilerFix AI puts the reference books, the paperwork and the business admin from your van into one app: boiler fault codes, service mode, calculators, gas and oil certificates, customers, invoices and bookkeeping. Open it once with a signal and the tools stay on your phone, so they work in the loft, the plant room or the cellar. DIAGNOSTICS AND REFERENCE - Boiler fault codes for the major UK manufacturers, with GC number lookup - Service mode reference: 1,700+ entries across 12 manufacturers, with combustion targets and manuals - Controls database: wiring, faults and installation guides for 140+ controls - Wiring diagrams: Y-plan, S-plan and combi, interactive and colour coded - Boiler manual search, spare parts lookup and manufacturer technical support numbers - Unsafe situations reference, Gas Safe technical bulletins, and regulations and standards - Cooker and hob installation guide CALCULATORS - Gas rate for imperial and metric meters - Heat loss to BS EN 12831 - Gas pipe sizing to BS 6891 - IV tightness test to IGEM/UP/1B Edition 4, with a pass/fail check - Radiator sizing at your flow temperature - Water quality testing to BS 7593 (pH, corrosion, inhibitor) CERTIFICATES AND RECORDS (25+) - Domestic: CP12 gas safety record, CP6 service record, warning notice, boiler commissioning, unvented hot water (G3), TMV commissioning, legionella risk assessment, fumes investigation report (CMDDA1) and job sheet - Commercial: CP14, CP15, CP16, CP17, CP42 and CP44, plus RAMS with pre-loaded commercial gas-work hazards - LPG: domestic, commercial, catering and mobile catering records - Oil (OFTEC): CD10, CD11, CD12 and CD14, plus TI/133D and TI/133ND tank risk assessments - Customer and site details come from your Customer Hub, so you do not retype them on every job RUN YOUR BUSINESS - Customer Hub: every customer's jobs, invoices, quotes and certificates in one place - Job calendar and service tracker with service reminders - Quotes and invoices with your own branding, sent as a PDF - Bookkeeping: profit and loss, invoices and expenses - Boiler Passport: register a boiler against a QR sticker, log every visit, and let the customer book their next service by scanning it - Quick links bar: pick the tools you use most and keep them one tap away YOUR DATA Jobs, customers, invoices and expenses sync securely to the cloud, so they are there on any device you sign in to. A copy stays on your phone so the app keeps working offline. TRY IT FREE Every new account gets a 7-day free trial. After that: - Basic, GBP 3.99 per month: diagnostics, calculators and domestic certificates - Pro, GBP 5.99 per month: everything in Basic plus the business tools, commercial, LPG and oil certificates, and the air source heat pump radiator check ABOUT THE NAME "AI" in BoilerFix AI refers to how the app was built: AI tools helped build and maintain the fault code database. The app itself does not include a chatbot or generate answers while you use it. Gas Safe registration belongs to individual engineers, not apps. BoilerFix AI is an independent tool and is not affiliated with or endorsed by Gas Safe Register, OFTEC or any boiler manufacturer. Always follow the manufacturer's instructions and current regulations. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel in your Apple ID account settings after purchase. Terms and privacy: https://boilerfix-ai.co.uk/terms Privacy policy: https://boilerfix-ai.co.uk/privacy-policy Support: boilerfixai@gmail.com
Screenshots
Verdict
The clearest difference is in-app purchases: Sentinel InstaCheck + at none against BoilerFix AI's 2. On price, update cadence, ads and device support there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. BoilerFix AI sells 2 in-app purchases, starting at $3.99 per month. Sentinel InstaCheck + asks for nothing beyond the download.
Sentinel InstaCheck + ships an update every 4 months, BoilerFix AI every 3 months. The most recent releases landed on October 28, 2026 and October 31, 2026 respectively.
| Parameter | Sentinel InstaCheck + | BoilerFix AI |
|---|---|---|
| Price | Free | Free |
| Positive reviews | โ | 100.0% of reviews |
| Update frequency | Every 4 months | Every 3 months โ better |
| Ads | No | No |
| In-app purchases | No โ better | Yes |
| Monetization | โ | Subscription |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details โ not scored | ||
| Size | 3 MB | 7 MB |
| Age rating | 4+ | 12+ |
| Developer | Energy & Compliance Technology Ltd | Stephen Bird |
In-app purchases
Sentinel InstaCheck +
No in-app purchases
BoilerFix AI
- BoilerFix AI Basic7 Days trial$3.991 Month
- BoilerFix AI Pro7 Days trial$5.991 Month
Questions
Is Sentinel InstaCheck + free?
Is BoilerFix AI free?
Do Sentinel InstaCheck + or BoilerFix AI have ads?
Which is updated more often, Sentinel InstaCheck + or BoilerFix AI?
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