Robokiller vs Spark Plug Reader
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Robokiller
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.
- 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
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Eliminate up to 99% of spam calls with Robokiller. Robokiller’s global database of 1.4 Billion analyzed calls instantly protects you from known phone scams. Our patented audio fingerprinting technology uses machine learning to stop your phone from ringing with annoying, unwanted calls. You can live life spam-call-free® and never miss a legitimate phone call again. But wait – there's more: Robokiller doesn't just block robocallers and spammers, we annoy the hell out of them, too. If you want Robocall Revenge®, your spam calls can be sent to clever recorded messages called Answer Bots, so they can see what it feels like to have their time wasted. With Robokiller, you can finally get that oh-so-sweet revenge on robocallers. OTHER SPAM-ELIMINATING ROBOKILLER FEATURES: PREDICTIVE CALL-BLOCKING POWER With Advanced Call Blocking, Robokiller analyzes all unrecognized calls using AI-powered audio fingerprinting technology. 24/7 UP-TO-DATE PROTECTION New spammers are continuously added to our global spam radar every MINUTE so your phone never rings from unwanted calls. KEEP YOUR PERSONAL INFO PRIVATE Robokiller’s new personal data protection feature scans the web to help you find and remove your private info from public search sites where it's sold and used for spam calls, identity theft and more. Take your info off the market and use our ongoing monitoring to notify you of any new exposures. GET REVENGE ON ROBOCALLERS Fight bots with bots. Answer Bots deliver payback in hilarious fashion, sending spammers to clever recordings that you can listen to later, driving them crazy and giving you the last laugh. SPAM TEXT BLOCKING Eliminate 99% of all spam text messages with Robokiller’s powerful, anonymized SMS blocking algorithm. Block unwanted text messages with accuracy and privacy. With over 11 Million downloads in the United States, Robokiller is a trusted source of powerful spam call and text protection. But, don’t take our word for it. Robokiller has been featured on The New York Times, NBC Nightly News, Good Morning America, Fox News, and many other publications. Robokiller has also been featured by Apple as a 2019 App of The Day, and won the 2020 Webby Award for Technical Achievement. HERE’S WHAT LIFE IS LIKE WITH ROBOKILLER: • A life without robocalls. Up to 99% of unwanted calls are eliminated within 7 days of signing up • Get the last laugh on robocallers and scammers with Robokiller’s Answer Bots. You may even WANT to get spam calls • Help out the community by reporting spammers and providing feedback directly from within the app • Track emerging scam trends and Robokiller’s efforts to stop them in your area with Robokiller’s NEW Radar feature • Save an average of $1400/year by preventing phone scams from ever reaching you. Source: FTC Robokiller is free to download. A subscription is required to use the service. Once the trial ends, your subscription will automatically renew and you’ll be billed. You can cancel your subscription at any time by contacting Apple Support. Terms of Service: http://www.robokiller.com/terms.html Privacy Policy: http://www.robokiller.com/privacy.html California Privacy Notice: https://robokiller.com/privacy.html#section-8
Spark Plug Reader
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Plug Read turns a spark plug into a diagnosis, and now it torques the replacement in correctly too. MATCHED BY EYE, NOT BY PART NUMBER Eight appearances, drawn as they come out of an engine. Tap the match and you get what it means and what to check, in the order worth checking it. INSTALL TORQUE, BY THREAD AND SEAT Pick the thread size and seat type, the head material, and get the torque range in both ft-lb and Nm, plus the hand-tight-and-turn fallback for when you do not have a torque wrench. Cross a plug wrong and you either strip the threads or leave it loose enough to blow out under compression, and the difference between right and wrong can be as little as five foot-pounds. THE PLUG IS THE CHEAPEST WINDOW INTO AN ENGINE Five minutes with a plug spanner tells you more about mixture, timing and oil control than an hour of guessing. NO PART NUMBERS, NO DATABASE Nothing here goes out of date, because it works from the plug in your hand and the thread you are installing into rather than a list of engine models. WORKS OFFLINE No account, no signal. The torque table is a published general reference cross-checked across several independent sources, not a measured specification for any specific engine. Manufacturer torque specification always takes precedence.
Screenshots
Verdict
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 (#8 vs unranked). On price, ads, 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. 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.
| Parameter | Robokiller | Spark Plug Reader |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (414K ratings) — better | — |
| Positive reviews | 32.8% of reviews | — |
| Number of ratings | 414K — better | — |
| Update frequency | Every 9 days | Every 2 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Best chart rank | #8 — better | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 16.4 |
| Further details — not scored | ||
| Size | 196 MB | 37 MB |
| Age rating | 4+ | 4+ |
| Developer | Mosaic S.r.l. | EVREN YUCEBAS |
Bugs and requests
Robokiller
Reported bugs
3 issues- Inconsistent call blocking performance
- Voicemails getting lost or inaccessible after uninstalling
- Difficulty deactivating or uninstalling the app
Requested features
4 requests- Ability to allow calls from contacts without blocking
- Customizable voicemail greeting
- Call history/log
- Better support for Canadian carriers
Spark Plug Reader
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Robokiller
- Membership (Inactive)7 Days trial$9.991 Month
- Weekly with FT7 Days trial$9.997 Days
- Membership7 Days trial$10.991 Month
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- Monthly (Inactive)7 Days trial$10.991 Month
- Membership(Inactive)7 Days trial$10.991 Month
- Membership (Inactive)7 Days trial$11.991 Month
- Membership (Inactive)7 Days trial$12.991 Month
- Membership7 Days trial$12.991 Month
- Membership7 Days trial$79.991 Year
- Membership(Inactive)7 Days trial$79.991 Year
- RoboKiller Membership7 Days trial$89.991 Year
Spark Plug Reader
- Full Version$4.99
Questions
Is Robokiller free?
Is Spark Plug Reader free?
Do Robokiller or Spark Plug Reader have ads?
Which is updated more often, Robokiller or Spark Plug Reader?
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