# Robokiller vs Spark Plug Reader

The clearest difference is update cadence: Spark Plug Reader at every 2 days against Robokiller's every 9 days. Robokiller's advantage is chart position (#6 vs unranked). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Robokiller sells 11 in-app purchases, starting at $9.99 per month and Spark Plug Reader sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Robokiller ships an update every 9 days, Spark Plug Reader every 2 days. The most recent releases landed on October 21, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Robokiller | Spark Plug Reader |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (414K ratings)](https://appshunter.io/ios/app/robokiller-spam-call-blocker/id1022831885/reviews)** | — |
| Number of ratings | **414K** | — |
| Positive reviews | 32.8% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 9 days | **Every 2 days** |
| Monetization | Free with in-app purchases | — |
| Best chart rank | **#6** | — |
| Size | 196 MB | 37 MB |
| Requires iOS | **15.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Mosaic S.r.l.](https://appshunter.io/developer/570748343) | [EVREN YUCEBAS](https://appshunter.io/developer/6782353474) |

## What reviewers say

### Robokiller

[App page](https://appshunter.io/ios/app/robokiller-spam-call-blocker/id1022831885)

**Currently charting:** #6 Top Grossing · Utilities, #194 Top Grossing (US App Store)

This app blocks up to 99% of unwanted spam calls and texts using advanced AI and a vast database. It also offers a unique feature to annoy spammers with automated responses and protects your personal information from being sold online.

**Highlights:** Blocks 99% of spam calls and texts, AI-powered audio fingerprinting, Answer Bots for robocaller revenge, Personal data protection and removal, 24/7 up-to-date spam protection, Spam text blocking

**Features:** Family Sharing, Vision Pro support

**In-app purchases (11)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Membership (Inactive) | $9.99 | per month |
| Weekly with FT | $9.99 | per 7 days |
| Membership | $10.99 | per month |
| Monthly (Inactive) | $10.99 | per month |
| Membership(Inactive) | $10.99 | per month |
| Membership (Inactive) | $11.99 | per month |
| Membership (Inactive) | $12.99 | per month |
| Membership | $12.99 | per month |
| Membership | $79.99 | per year |
| Membership(Inactive) | $79.99 | per year |
| RoboKiller Membership | $89.99 | per year |

**What reviewers like**

- 🚀 Blocks spam calls effectively
- 😂 Entertaining answer bots
- 🤫 Reduces unwanted call volume
- 👍 Convenient call screening

**What reviewers complain about**

- 🐛 App issues like resetting, deactivation, and call forwarding problems
- 🚫 Blocks some legitimate calls
- 🤖 Concerns about increased spam calls after using the app
- 💰 Expensive subscription, additional carrier charges

**Reported bugs**

- Inconsistent call blocking performance
- Voicemails getting lost or inaccessible after uninstalling
- Difficulty deactivating or uninstalling the app

**Requested features**

- Ability to allow calls from contacts without blocking
- Customizable voicemail greeting
- Call history/log
- Better support for Canadian carriers


### Spark Plug Reader

[App page](https://appshunter.io/ios/app/spark-plug-reader/id6805215335)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version | $4.99 | one-time |


## Frequently asked questions

### Is Robokiller free?

Robokiller is free to download, with in-app purchases available.

### Is Spark Plug Reader free?

Spark Plug Reader is free to download, with in-app purchases available.

### Do Robokiller or Spark Plug Reader have ads?

Neither Robokiller nor Spark Plug Reader shows ads.

### Which is updated more often, Robokiller or Spark Plug Reader?

Robokiller ships an update every 9 days, and Spark Plug Reader every 2 days. Most recently, Robokiller was updated on October 21, 2026 and Spark Plug Reader on October 6, 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.*