555 Calc vs Coolite
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
555 Calc
This utility app helps engineers and hobbyists calculate resistor values for circuits using the Timer IC 555. Simply input frequency, duty ratio, and capacitor values to get the required resistor outputs.
- Calculate resistor values
- Input frequency
- Input duty ratio
- Input capacitor value
- Timer IC 555 circuit design
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This App calculates registors value, when designing the circuit using Timer IC 555. How to (1) Input Frequency value. (2) Input Duty Ratio. (3) Input C1 Value. (4) Touch ‘Calculate’ button. (5) Registors value will be displayed. Note. * Set Duty Ratio to 50 ~ 99. * If you set Duty Ratio to 50, R1 value will be set to 0.
Coolite
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This is the LED screen that meets all your needs. It can edit text, customize pictures, send interesting custom animations, and dance with the built-in music of the phone. Rich brightness and speed adjustment function, can be left and right up and down switch, all you can think of it has. Highly personalized settings ensure its uniqueness. 这是满足您所有需求的LED屏幕。它可以编辑文本、定制图片、发送有趣的自定义动画、随手机内置音乐跳舞。丰富的亮度和速度调节功能，可以左右上下切换，所有你能想到的它都有。高度个性化的设置保证了它的独特性。
Screenshots
Verdict
The clearest difference is ads: Coolite at none against 555 Calc's shown. Coolite also leads on update cadence (every 10 days vs every 20 months) and iOS requirement (9.1 vs 11.0). On price, in-app purchases 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
555 Calc ships an update every 20 months, Coolite every 10 days. The most recent releases landed on September 27, 2026 and October 7, 2026 respectively.
| Parameter | 555 Calc | Coolite |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (3 ratings) — better | — |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 3 — better | — |
| Update frequency | Every 20 months | Every 10 days — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 11.0 | 9.1 — better |
| Further details — not scored | ||
| Size | 18 MB | 44 MB |
| Age rating | 4+ | 4+ |
| Developer | Jibiki Works | Shenzhen Heaton Technology Co., Ltd. |
In-app purchases
555 Calc
No in-app purchases
Coolite
No in-app purchases
Questions
Is 555 Calc free?
Is Coolite free?
Do 555 Calc or Coolite have ads?
Which is updated more often, 555 Calc or Coolite?
Other comparisons
