The short answer
- Start with Apple's built-in filters. They are free, private and good enough for many people. Turn on Screen Unknown Senders and Filter Spam (Settings → Apps → Messages, in the Unknown Senders section).
- Spam calls are your main problem? Look at a call-and-text suite (Robokiller, Nomorobo). You pay for the call blocking; the text filter comes along.
- Texts only, and you care where your messages are processed? Pick an on-device filter: Junkman if you want categories and fine control, Bouncer if you want to pay once and write your own rules, AntiSpam if you want explicit protection for codes and bank alerts and published measurements.
- Whatever you pick, iOS runs one third-party SMS filter at a time, no filter sees iMessage or your contacts, and none of them is perfect. Keep checking the Spam folder for a while.
How we compared, and what we didn't do
Everything in the table comes from public sources on 23 October 2026: App Store listings (prices, rating counts, descriptions), the developers' websites and Apple's documentation. We have not run the same set of texts through every app, so this page makes no claims about which app catches more spam. When we publish a head-to-head test, it will be on our accuracy page with the data described.
"On device" in the table means the developer states that the filtering decision is made on the phone. Apple runs every filter extension without network access, but a developer can declare a server that iOS forwards messages to; where a developer doesn't say, we write "not stated" rather than guessing.
The comparison
| Option | Scope | How it decides | Where | Price (US, Oct 2026) | US ratings | Good at | Watch out for |
|---|---|---|---|---|---|---|---|
| Apple built-in Screen Unknown Senders + Filter Spam (iOS 26+) |
SMS, MMS, RCS | Sender known or not; Apple's own spam detection | On device | Free | n/a | Zero setup, zero cost, strongest privacy. Mutes everything from strangers. | Sorts by sender, so real first-time texts (codes, deliveries) also go silent. No control over what counts as spam. |
| Carrier tools (e.g. AT&T ActiveArmor, Verizon Call Filter, T-Mobile Scam Shield; 7726 reporting in many countries) |
Calls and texts at network level | Carrier reputation data | Carrier network | Free basic tiers; paid upgrades vary | n/a | Blocks known bad senders before they reach you; works on any phone. | Coverage differs by carrier and country; content filtering is limited; your traffic is already with the carrier. |
| Robokiller | Calls + texts | Large database of reported numbers and scams | Not stated for texts; database-driven service | $10.99–12.99/mo $79.99–89.99/yr |
414K | The most established call blocker; big data pool; answer bots. | The most expensive option here; call-focused; requires an account. |
| Textkiller (Robokiller's text-only app) |
Texts | Robokiller's scam database | Not stated; database-driven | $5.99–7.99/mo $69.99–79.99/yr |
13K | Same data as Robokiller without the call features; well known. | Pricey for texts only; its App Store listing showed a last update in February 2025 when we checked. |
| Junkman | Texts | On-device machine-learning models (English, French, Turkish) plus your own rules; sorts into Transactions and Promotions | On device (developer states it works completely locally) | $3.99/mo $24.99/yr $124.99 lifetime |
120 (7.7K in Türkiye) | The most configurable on-device filter: categories, schedules, custom rules, three languages. | Lots of settings to learn; small user base outside Türkiye; lifetime price is high. |
| Bouncer | Texts | Rules and keyword filters you set, plus built-in patterns | On device (per its listing) | $4.99 once | 504 | Pay once; private; simple. | Rule-based filtering needs maintenance as spam changes; small team. |
| TextShield | Texts | Filtering plus inbox sorting | Not stated | $3.99/mo $29.99/yr |
130 | Tidies codes and updates into folders as well as blocking spam. | Small user base; little public detail on method or accuracy. |
| Nomorobo | Calls + texts | Robocaller database | Not stated for texts; database-driven | $2.99–5.99/mo $19.99–39.99/yr |
22K | Cheapest of the call-and-text suites; long track record on robocalls. | Text filtering is the secondary feature. |
| AntiSpam (us) | Texts | Explicit protective rules for codes, bank alerts, deliveries and reminders, then scam and marketing rules, then a small on-device model | On device; no server declared | 1 month free, then $2.99/mo, $12.99/yr or $24.99 once | New outside Türkiye | Protected categories are rules, not hopes; dated, published measurements; the longest free trial here. | English engine is new; no call blocking; spam or not spam only, no Transactions/Promotions sorting; one developer. |
Not in the table: caller-ID networks such as Truecaller and Hiya. They are built around calls; Truecaller (from $9.99 a month in the US) also offers an SMS filter on iPhone, requires an account and relies on user-contributed data. SpamHound, a free keyword filter, is popular but its listing had not been updated since 2021 when we checked.
Notes on each option
Apple's built-in filters
Since iOS 26, Screen Unknown Senders parks texts from anyone outside your Contacts in a muted folder with links disabled, and Filter Spam moves texts Apple's own detection considers spam to a Spam folder. Together they remove most of the noise for most people, at no cost and with nothing leaving the phone. The weakness is structural: screening sorts by sender, so a legitimate first-time sender is treated like a scammer, and you end up checking the Unknown Senders folder. Our guide to Screen Unknown Senders explains the folder, the notification categories and Mark as Known.
Carrier tools
US carriers bundle spam protection (AT&T ActiveArmor, Verizon Call Filter, T-Mobile Scam Shield), and in the US, UK, Canada and many other countries forwarding a text to 7726 feeds the carrier's blocking. These work before the text reaches your phone and on any device. They are weakest on content: a scam from a fresh number with a fresh domain sails through until enough people report it.
Robokiller and Textkiller
Robokiller is the best-known call blocker on the App Store, with Textkiller as its text-only sibling. Both lean on a very large database of reported numbers and scam texts. If robocalls are your main problem, Robokiller is a reasonable place to spend money; for texts alone, Textkiller is expensive compared with the on-device options, and its listing's last update was eight months old when we checked.
Junkman
Junkman is the closest thing to AntiSpam in spirit and the more mature product: on-device machine learning in English, French and Turkish, classification into junk, transaction and promotion, custom rules, schedules and an "under attack" mode. Its developer states that it works completely locally and transmits no message. If you enjoy configuring things, it is the most capable on-device filter available. It is also the leader in Türkiye by a wide margin.
Bouncer
Bouncer is a one-time purchase that filters with built-in patterns and rules you write yourself, and its listing stresses that texts stay on the device. It suits people who want to pay once and are happy to add a keyword when a new wave of spam arrives.
TextShield and Nomorobo
TextShield combines filtering with inbox sorting and has a small user base; its developer publishes little about the method. Nomorobo is a long-standing robocall blocker whose subscription includes a text filter; it is the cheapest of the call-and-text suites.
AntiSpam
Our app does one thing: it reads each text iOS hands it, on the phone, and says spam or not spam. Verification codes, bank and card alerts, delivery updates, appointment reminders and short personal texts are protected by explicit rules that run before anything is scored. We publish how we measure and what we got (accuracy and method), and the trial is a full month.
Where AntiSpam falls short
- English is new. The Turkish engine has eight years of real data behind it; the English engine was measured on public research datasets, which don't yet include bank or service texts from the US, UK or Australia. Expect more misses than in Turkish, especially on brand-new scam templates.
- Texts only. No call blocking, no caller ID, no answer bots.
- Spam or not spam. AntiSpam doesn't sort texts into Transactions and Promotions the way Junkman and TextShield do.
- Few knobs. You get allow and block lists for senders, not custom keyword rules or schedules.
- One developer, email support. Replies usually take a few days, not minutes.
- Few ratings outside Türkiye. We launched in English in 2026; the App Store will show that.
How to choose
- Turn on Apple's filters first and live with them for a week.
- Count what still gets through and what went missing. Mostly calls: a call suite. Mostly spam texts getting through: a content filter. Mostly real texts lost in Unknown Senders: a filter that marks must-see texts, plus Mark as Known.
- Check the privacy label and the developer's own statement about where decisions are made.
- Use the trial and watch the Spam folder for a few days. The right filter is the one whose mistakes you can live with.
Questions
Do I need a spam text blocker app on iPhone at all?
Start without one. Turn on Screen Unknown Senders and Filter Spam in the Unknown Senders section of Settings → Apps → Messages. If scam or marketing texts still get through, or you rely on texts from unknown senders and don't want to live in the Unknown Senders folder, add one filter app.
Can I run two SMS filter apps at the same time?
No. iOS lets you select one third-party SMS filter under Text Message Filter. Apple's own Screen Unknown Senders and Filter Spam stay active alongside it.
Which spam text blocker is the most private?
Apple runs every filter extension without network access, but it lets a developer declare a server that the system can forward texts to. Apps that state they decide entirely on the device, such as Junkman, Bouncer and AntiSpam, keep message content on the phone while filtering (AntiSpam sends a text only if you report it, masked on the phone first). For the others, check the App Privacy label and the developer's documentation; database-driven services usually need some form of server lookup.
Why do most spam text blockers charge a subscription?
Spam templates change every month, so the rules, models or databases behind a filter need continuous work. Call-blocking suites also run servers for caller ID. One-time-purchase apps such as Bouncer exist; they tend to rely on rules you maintain yourself.
Does a spam text blocker see my iMessages or WhatsApp?
No. Apple's filter extensions receive SMS and MMS (and, on recent iOS versions, RCS) from senders who aren't in your Contacts. iMessage and chat apps are out of scope for every app in this comparison.
If protected codes and a free month sound right
AntiSpam filters on your iPhone and protects verification codes and bank alerts with rules that run first. Try it for a month and judge it on your own texts.
Download on the App Store What it does and doesn't do · Accuracy and method