Timer 555 Calculator Pro vs HeatNext
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Timer 555 Calculator Pro
Calculate parameters for monostable and astable circuits. Find component combinations for desired pulse width or frequency. Share circuit files via iCloud Drive or AirDrop.
- Calculate monostable pulse width
- Calculate astable frequency
- Find component combinations
- Adjust component tolerance
- Unlimited combinations (Pro)
- Share circuit files
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This app is used to calculate monostable and astable circuit. Features * Calculate pulse width of monostable circuit * Calculate frequency of astable circuit * Find out combination of components making a desire pulse width in monostable circuit * Find out combination of components making a desire frequency in astable circuit * Share file to iCloud Drive (For iOS8 or later) * Share file via AirDrop Additional Features in the Professional Edition * Unlimited number of combinations * Allow to change tolerance * No ads
HeatNext
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HeatNext is a friendly app that allows you to remotely manage your home heating system using your mobile device. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/.
Screenshots
Verdict
The clearest difference is price: HeatNext at Free against Timer 555 Calculator Pro's $0.99. Timer 555 Calculator Pro's advantage is in-app purchases (none vs 4). On update cadence, ads, device support and iOS requirement 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
HeatNext is free to download; Timer 555 Calculator Pro costs $0.99 up front. HeatNext sells 4 in-app purchases, starting at $1.99 per month. Timer 555 Calculator Pro asks for nothing beyond the download.
Timer 555 Calculator Pro ships an update every 3 months, HeatNext every 2 months. The most recent releases landed on June 4, 2026 and September 15, 2026 respectively.
| Parameter | Timer 555 Calculator Pro | HeatNext |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 4.7 (3 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 3 — better | — |
| Update frequency | Every 3 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.2 | 13.0 — better |
| Further details — not scored | ||
| Size | 3 MB | 32 MB |
| Age rating | 4+ | 4+ |
| Developer | Siu Yuen Ho | Nomnio |
In-app purchases
Timer 555 Calculator Pro
No in-app purchases
HeatNext
- Plus Package$1.991 Month
- Advanced Package$3.991 Month
- Plus Package$18.991 Year
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- Advanced Package$37.991 Year
Questions
Is Timer 555 Calculator Pro free?
Is HeatNext free?
Do Timer 555 Calculator Pro or HeatNext have ads?
Which is updated more often, Timer 555 Calculator Pro or HeatNext?
Other comparisons
