# Temper: Knife Heat Treat — Knife heat-treat schedules > Knife heat-treatment reference with sourced schedules and failure warnings. (iPhone/iPad app by Roman Kopaliani.) - Source: https://appshunter.io/ios/app/temper-knife-heat-treat/id6777764715 (this page in markdown: same URL + `.md`) - Developer: [Roman Kopaliani](https://appshunter.io/developer/1635315269) - Category: Utilities, Lifestyle - Price: Free with in-app purchases - Rating: 5.00/5 from 1 App Store ratings · 1 written reviews indexed - Age rating: 4+ - Requires: iOS 17.0 · 1 MB - Languages: American English - Released: 2026-06-11 - Data updated: 2026-08-19 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/temper-knife-heat-treat/id6777764715/reviews.md ## What is Temper? Temper is a shop-floor reference for knife heat-treatment. Every schedule cites a primary source — a Knife Steel Nerds article by Larrin Thomas or the steel manufacturer's datasheet — with a direct link, so you can verify the page that the recipe comes from. WHAT'S INSIDE • 20 steel schedules — simple carbon (1084, 80CrV2, 1095, 8670, 15N20), spring/tool (52100, 5160, O1, A2, D2), stainless (AEB-L, 14C28N, CPM-154, S35VN, S45VN), and PM super-steels (M390, CPM-3V, CPM MagnaCut, MagnaMax, ApexUltra). • Per-use-case HRC targets — Kitchen, EDC, Hunter, hard-use chopper. Each steel maps to a hardness range that works for the use the blade actually sees. • Named failure-mode warnings — six surfaced inline when they apply: 5160 grain growth past 1525°F, undersoaking, quench-to-cryo delay, retained austenite from over-austenitizing, one second past nonmagnetic in simple carbons, and wrong quench medium for stainless. Each cites the specific Larrin Thomas article it came from. • Quench-medium guidance — primary, acceptable alternates, and a hard interlock for blocked media (never water-quench plain carbon; never oil-quench stainless or PM). • Cryo decision matrix — per-steel-class retained-austenite framing with named cryo media (household freezer, dry ice + acetone, liquid nitrogen). • HRC ↔ HV ↔ HB ↔ tensile conversions — from ASTM E140-12b Table 1. • Source-version stamps — every schedule shows when the cited source was last updated, so you know if your reference has shifted. FREE TIER Three starter steels — 1084, 80CrV2, AEB-L — are free permanently with full citations and warnings. You can heat-treat a 1084 blade end-to-end on the free tier. The IAP is for breadth, not depth. UNLOCK ($6.99, ONE-TIME) The Temper Unlock IAP adds: • The other 17 steel schedules • Per-steel saved profile — persist the schedule you actually used and the HRC you actually measured • Multi-session log — every heat-treat run with date, austenitize, soak, quench, cryo, temper, measured HRC, and notes No subscriptions. No ads. No account. DISCLAIMER Temper presents Knife Steel Nerds and steel-manufacturer guidance for educational purposes. Verify schedules against current Knife Steel Nerds articles and your steel supplier's spec sheet before heat-treating. CITATIONS Schedules reference Larrin Thomas's articles at knifesteelnerds.com and datasheets from New Jersey Steel Baron, Crucible Industries, and Bohler-Uddeholm. Hardness conversions are from ASTM E140-12b Table 1 (Non-Austenitic Steels). ## Key features - 20+ steel schedules - Per-use-case HRC targets - Named failure-mode warnings - Quench-medium guidance - Cryo decision matrix - Hardness conversions ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Temper Unlock (lifetime) | $6.99 | one-time | ## Recent user reviews (1 of 1) All indexed reviews: https://appshunter.io/ios/app/temper-knife-heat-treat/id6777764715/reviews.md ### 5/5 — Huge for my first blades *2026-07-01* started making knives this year and the heat treat part scared me the most. this lays out the temps and times so i'm not just winging it. edge holds way better now ## Frequently asked questions about Temper ### Does Temper have ads? No, Temper is ad-free. The app explicitly states 'No ads' and the provided data confirms it does not contain advertisements. ### What is the cost of Temper? Temper offers a free tier with three starter steels. Additional steels and features can be unlocked with a one-time in-app purchase of $6.99. ### How often is Temper updated? The latest version of Temper is 1.1, last updated on July 2, 2026. This indicates a recent update, suggesting ongoing development and support. ### What devices does Temper support? Temper is available on iPhone and iPad, as indicated by the supported devices list. ### What is the age rating for Temper? Temper has an age rating of 4+, making it suitable for a wide range of users interested in its utility. ### What are the benefits of the Temper Unlock IAP? The Temper Unlock IAP adds 17 more steel schedules, allows you to save your used profiles and measured HRC, and provides a multi-session log for tracking heat-treat runs. ### Where does Temper get its data? Temper cites primary sources for every schedule, including Knife Steel Nerds articles by Larrin Thomas and steel manufacturer datasheets, with direct links for verification. ### Does Temper require an account? No, Temper does not require an account to use. The app emphasizes privacy and ease of access without the need for user registration. ## Version history (last 4 releases) ### 1.3 — 2026-08-15 Maintenance update. No feature changes. ### 1.2 — 2026-07-16 The number keyboard now has a Done button, so you can dismiss it when you're finished. Thanks to everyone who wrote in about this. ### 1.1 — 2026-07-02 New: a quick-jump list of related Moon Dog maker's calculators in Settings — leatherwork, soap, candles and glaze. Plus reliability improvements. Heat-treat with confidence. ### 1.0 — 2026-06-11 No release notes. ## More apps by Roman Kopaliani - [Soak: Hot Tub & Spa Calc](https://appshunter.io/ios/app/soak-hot-tub-and-spa-calc/id6775030424) - [Frost: Cold Plunge Care](https://appshunter.io/ios/app/frost-cold-plunge-care/id6776702484) - [Reef: Aquarium Chemistry Calc](https://appshunter.io/ios/app/reef-aquarium-chemistry-calc/id6776750986) - [Pond: Koi Chemistry](https://appshunter.io/ios/app/pond-koi-chemistry/id6777459595) - [Watt: Solar for Van & RV](https://appshunter.io/ios/app/watt-solar-for-van-and-rv/id6777471058) - [Saline: Saltwater Pool Calc](https://appshunter.io/ios/app/saline-saltwater-pool-calc/id6777715538) All apps by Roman Kopaliani: https://appshunter.io/developer/1635315269 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-19.*