# Voltas BMS vs Pocket Seismograph

The clearest difference is update cadence: Voltas BMS at fortnightly against Pocket Seismograph's every 3 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Voltas BMS ships an update fortnightly, Pocket Seismograph every 3 months. The most recent releases landed on October 27, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | Voltas BMS | Pocket Seismograph |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 3 months |
| Size | 35 MB | 23 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [VOLTAKER Kereskedelmi Korlatolt Felelossegu Tarsasag](https://appshunter.io/developer/1577347073) | [lapnito.cz s.r.o.](https://appshunter.io/developer/1577358577) |

## What reviewers say

### Voltas BMS

[App page](https://appshunter.io/ios/app/voltas-bms/id1568684666)

**Features:** macOS Compatibility

**In-app purchases:** none


### Pocket Seismograph

[App page](https://appshunter.io/ios/app/pocket-seismograph-vibration/id6766446046)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Voltas BMS free?

Voltas BMS is free to download, with no in-app purchases.

### Is Pocket Seismograph free?

Pocket Seismograph is free to download, with no in-app purchases.

### Do Voltas BMS or Pocket Seismograph have ads?

Neither Voltas BMS nor Pocket Seismograph shows ads.

### Which is updated more often, Voltas BMS or Pocket Seismograph?

Voltas BMS ships an update fortnightly, and Pocket Seismograph every 3 months. Most recently, Voltas BMS was updated on October 27, 2026 and Pocket Seismograph on November 5, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*