Thermal Light vs OCRBook
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Thermal Light
This app measures the temperature of extremely hot objects by analyzing the light they emit. It's designed for users working with materials like iron, steel, and copper, offering a cost-effective alternative to specialized thermometers.
- Measures temperatures from 1000F to 2700F
- Uses black body radiation analysis
- Calibrated against certified IR thermometer
- Cost-effective alternative to IR thermometers
- Supports iron, steel, and ceramics
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Thermal Light is the first of its kind app that uses black body radiation of an object (iron/steel, copper, ceramics) to determine temperatures between 1000F and 2700F. Very hot objects irradiate light; the app uses this light to determine the temperature between 1000 and 2700F. The app has been calibrated against a certified IR thermometer. Why spend $900 for an IR or optical thermometer when you can convert your iPhone to do the same thing? This is great for knowing the temperature of your steel for working. Temperature increments are 50F. Please go to support website for more details at http://houseofficer.com/forgingtemperature
OCRBook
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Turn scanned books and PDFs into clean, searchable, and easy-to-read text with fast OCR and private AI assistance. OCRBook converts scanned pages into structured text, generates clear summaries, and lets you listen with natural TTS. OCR runs directly on your device, while AI features connect securely to your own home or private AI server — not a public cloud. Key Features - Fast & Accurate OCR Extract text from scanned books, documents, and PDFs Multi-language support powered by Apple Vision Enhanced recognition for curved pages and low-quality scans Batch processing for entire documents - Private AI Summaries Generate chapter or full-book summaries via your personal AI server No public cloud processing or shared infrastructure Ideal for studying, reviewing, and quick understanding You stay in control of where AI processing happens - Natural Text-to-Speech Listen to scanned text with high-quality system voices Continuous reading across pages Adjustable speed and language Background playback supported - Smart File Management Import PDFs from Files, iCloud Drive, or other apps Export OCR results as searchable TXT or ZIP files Organize books with tags and metadata Fast Spotlight search across your library - Powerful Search Instant full-text search across all OCR content Context snippets show exact match locations Filter by book, date, or tags - Privacy-First Design OCR runs locally on your device AI connects only to your own remote or home server No tracking, no analytics, no automatic uploads Your data stays under your control Perfect For Students and researchers Personal ebook digitization Archive and document management Anyone working with scanned PDFs Why OCRBook? Because scanned books should be readable, searchable, and understandable. OCRBook turns raw scans into clean text and pairs them with private AI tools — without handing your data to public cloud services.
Screenshots
Verdict
The clearest difference is iOS requirement: Thermal Light at 16.6 against OCRBook's 18.6. On price, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Thermal Light costs $1.99 and OCRBook $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Thermal Light ships an update weekly, OCRBook every 8 days. The most recent releases landed on November 1, 2026 and November 9, 2026 respectively.
| Parameter | Thermal Light | OCRBook |
|---|---|---|
| Price | $1.99 | $1.99 |
| Rating | 2.3 (6 ratings) — better | — |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 6 — better | — |
| Update frequency | Weekly — better | Every 8 days |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 16.6 — better | 18.6 |
| Further details — not scored | ||
| Size | 2 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | Crystal Clear Solutions | FiveStar AI |
In-app purchases
Thermal Light
No in-app purchases
OCRBook
No in-app purchases
Questions
Is Thermal Light free?
Is OCRBook free?
Do Thermal Light or OCRBook have ads?
Which is updated more often, Thermal Light or OCRBook?
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