Comparison

VoltLog vs MainframeMonitor

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

Head to head
About

VoltLog

Features
Read full description

VoltLog is a field tool for FPV pilots who use LiPo, LiHV, and Li-ion battery packs without smart battery electronics. After a flight, log the pack voltage and VoltLog shows the safety status of each battery on a clear, color-coded dashboard. The goal is simple: know which packs are safe for storage, which need charging, and which should not be left full for too long. Built for FPV battery routines: - Track battery packs with name, brand, cell count, capacity, chemistry, and cycle count - Log voltage per cell with a large custom keypad - See STORAGE, CHARGED, FULL, FULL RISK, DISCHARGED, and CRITICAL states at a glance - Open full cycle history for every pack - Set global and per-battery alert timing - Use local notifications for risky full packs and low-voltage reminders - Work offline-first with local Drift storage - Secure or switch accounts with Supabase Auth when you want cloud-backed data VoltLog is not a charger, cell checker, or battery management system. It is a practical logbook for pilots who already measure voltage and want a faster way to keep track of many packs. Designed for the field, not a desk: - High-contrast dark dashboard - Large battery tiles - Fast voltage entry without the system keyboard - Battery archive for retired packs - English and Polish interface If your FPV case has more packs than memory can reliably track, VoltLog gives you one place to see what needs attention before battery degradation becomes expensive. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

MainframeMonitor

Transform your iPhone into a vintage mainframe with a nostalgic CRT display. Monitor live system stats like battery, CPU, and memory, all within an authentic retro console experience. Includes hidden classic text-based games.

Highlights
  • Live system monitoring (battery, CPU, memory, storage)
  • Home screen widgets
  • Authentic CRT effects (glow, scanlines)
  • Retro boot sequence
  • Hidden classic text-based games
  • Customizable color themes (Green, Amber)
Features
Read full description

Turn your iPhone into a mainframe from the golden age of computing. MAINFRAME MONITOR shows your device's live stats wrapped in a nostalgic CRT console – complete with phosphor glow, scanlines, a boot sequence and satisfying key clicks. Choose between classic GREEN or warm AMBER, each with its own matching app icon. ■ LIVE SYSTEM MONITOR • Battery, CPU, memory and free storage • Uptime, network status and device info • All in real time, right on the glowing screen ■ HOME SCREEN WIDGET • Keep your key system stats always in view • In the same retro CRT style ■ REAL MAINFRAME FEELING • Authentic boot sequence on launch • Scanlines, glow and CRT effects • Terminal-style PF function-key controls ■ HIDDEN CLASSIC GAMES • Snake, Hamurabi, Void Patrol and Bagels • Text-based retro games, just like on the old terminals ■ FAIR & PRIVATE • Completely free • No ads, no trackers, no accounts • All data stays on your device Whether as a stylish system monitor, a home screen widget or a hands-on piece of computing history – MAINFRAME MONITOR brings back the charm of the old data centers. Made with attention to detail. Be sure to check out my other apps right inside the app.

Screenshots

VoltLog4 screens
MainframeMonitor4 screens

Verdict

The call

The clearest difference is in-app purchases: MainframeMonitor at none against VoltLog's 3. On price, update cadence, ads 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. VoltLog sells 3 in-app purchases, starting at $9.99 per month. MainframeMonitor asks for nothing beyond the download.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 10 days. The most recent releases landed on October 6, 2026 and October 14, 2026 respectively.

Scorecard1 real difference · 8 level
VoltLog versus MainframeMonitor: the parameters behind the verdict, then further details
ParameterVoltLogMainframeMonitor
PriceFreeFree
Rating—5.0 (1 ratings) — better
Number of ratings—1 — better
Update frequencyEvery 10 daysEvery 10 days
AdsNoNo
In-app purchasesYesNo — better
Monetization—Free
DevicesiPhoneiPhone, iPad — better
Requires iOS16.0 — better17.0
Further details — not scored
Size54 MB24 MB
Age rating4+4+
DeveloperFilip RusinRalf Langhoff

In-app purchases

3 purchases

VoltLog

Subscriptions2
  • Monthly Pro$9.991 Month
  • Yearly Pro$39.991 Year
One-time1
  • Lifetime Pro$99.99
None

MainframeMonitor

No in-app purchases

Questions

Is VoltLog free?
VoltLog is free to download, with in-app purchases available.
Is MainframeMonitor free?
MainframeMonitor is free to download, with no in-app purchases.
Do VoltLog or MainframeMonitor have ads?
Neither VoltLog nor MainframeMonitor shows ads.
Which is updated more often, VoltLog or MainframeMonitor?
VoltLog ships an update every 10 days, and MainframeMonitor every 10 days. Most recently, VoltLog was updated on October 6, 2026 and MainframeMonitor on October 14, 2026.

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