OHSA vs Permit To Work
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OHSA
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OHSA APP effectively covers the current management content in the field of EHS management, including risk classification control, hidden danger investigation, intelligent patrol inspection, non-compliant work closed loop, construction operation approval, special operation approval, external document approval, hazardous waste scrap approval, laws and regulations query and other functions.
Permit To Work
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Permit To Work App, 展示RFI表单， RISC表单， 安全检查， 清洁检查等模块 Permit To Work App, 展示RFI表單， RISC表單， 安全檢查， 清潔檢查等模塊
Screenshots
Verdict
The clearest difference is iOS requirement: OHSA at 9.0 against Permit To Work's 15.0. 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
OHSA ships an update every 4 months, Permit To Work every 2 months. The most recent releases landed on October 9, 2026 and October 10, 2026 respectively.
| Parameter | OHSA | Permit To Work |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 4 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 9.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 8 MB | 44 MB |
| Age rating | 4+ | 4+ |
| Developer | 上海欧萨数据技术有限公司 | Synergos Systems Company Limited |
In-app purchases
OHSA
No in-app purchases
Permit To Work
No in-app purchases
