Comparison

iStopwatch vs 石油助手

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

iStopwatch

Features
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A precision LCD-style stopwatch with lap tracking, volume key control, and customizable fonts. Whether you're timing a run, coaching a sport, or need a reliable counter for any task, iStopwatch delivers with style and accuracy. KEY FEATURES • LCD Display — Authentic digital display with glowing digits, just like a real LCD stopwatch • Lap Tracking — Record unlimited laps with fastest/slowest indicators • Volume Key Control — Start, record, pause, and reset using your device's volume buttons — no need to touch the screen • 6 Custom Fonts — Choose from Digital-7, Orbitron, Share Tech Mono, VT323, Menlo, or SF Mono • 4 LCD Themes — Switch between LCD Cyan, Green, Blue, or a dazzling Purple-Pink-Blue gradient • Haptic & Sound Feedback — Feel and hear every action • Background Timing — Keeps counting even when you switch apps • Copy Records — Share your lap data instantly • Dark Mode — Easy on the eyes, perfect for any lighting PERFECT FOR - Running and jogging - Swimming and cycling - Workout intervals - Cooking and baking - Lab experiments - Any timing task Download iStopwatch and time everything with precision.

About

石油助手

Features
Read full description

石油助手是一款面向石油工程现场人员的专业计算工具,把现场常用的计算、换算和资料查询装进口袋,帮助钻井、录井、固井及工程技术人员快速、准确地完成日常计算。 【核心功能】 · 钻井计算 覆盖井眼容积、环空容积、起下钻灌浆、顶替排量、钻具内容积等 20 余项现场常用计算。 · 钻井液计算 密度调整、加重剂用量、降密度、混浆、固相含量、循环周等 15 项钻井液工程计算。 · 固井计算 水泥浆量、附加量、顶替液量、碰压等固井设计相关计算。 · 单位换算 压力、密度、长度、体积、温度、黏度等多类工程单位互换,支持公制与现场常用单位。 · 公式速查 内置常用工程公式与参数,随用随查,无需翻阅手册。 · 参考资料 钻井液处理剂、水泥外加剂、岩石密度、油田常用换算等查询表。 【为什么选择石油助手】 · 离线可用 —— 核心计算与单位换算无需联网,野外现场也能用。 · 即开即用 —— 首次启动自动创建账号,核心功能无需注册登录。 · 结果即时 —— 输入参数自动计算,省去手算与翻表。 · 跨设备同步 —— 可选登录后,个人数据多端同步。 【温馨提示】 本 App 计算结果仅供工程参考,最终决策应由具备资质的工程师结合现场实际条件复核后实施。 如有问题或建议,欢迎通过邮箱 info@oilany.com 联系我们。

Screenshots

iStopwatch2 screens
石油助手4 screens

Verdict

The call

The clearest difference is in-app purchases: 石油助手 at none against iStopwatch's 1. 石油助手 also leads on ads (none vs shown) and update cadence (every 2 weeks vs monthly). On price and device support 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. iStopwatch sells 1 one-off in-app purchase. 石油助手 asks for nothing beyond the download.

UpkeepUpdate frequency

iStopwatch ships an update monthly, 石油助手 every 2 weeks. The most recent releases landed on November 6, 2026 and November 5, 2026 respectively.

Scorecard4 real differences · 2 level
iStopwatch versus 石油助手: the parameters behind the verdict, then further details
ParameteriStopwatch石油助手
PriceFreeFree
Update frequencyMonthlyEvery 2 weeks — better
AdsYesNo — better
In-app purchasesYesNo — better
DevicesiPhoneiPhone, iPod — better
Requires iOS16.013.0 — better
Further details — not scored
Size9 MB36 MB
Age rating4+4+
Developer景珂 陈Sichuan Jupai Technology Co., Ltd.

In-app purchases

1 purchases

iStopwatch

One-time1
  • Pro Version$1.99
None

石油助手

No in-app purchases

Questions

Is iStopwatch free?
iStopwatch is free to download, with in-app purchases available.
Is 石油助手 free?
石油助手 is free to download, with no in-app purchases.
Do iStopwatch or 石油助手 have ads?
iStopwatch shows ads; 石油助手 does not.
Which is updated more often, iStopwatch or 石油助手?
iStopwatch ships an update monthly, and 石油助手 every 2 weeks. Most recently, iStopwatch was updated on November 6, 2026 and 石油助手 on November 5, 2026.

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