Comparison · Fitness rings · Desk research
Oura Ring 4 vs Oura Ring 5
Side-by-side manufacturer cells from the two named ring pages. Not a lab test. Brand grouping uses the published brand field (Oura).
Quick Answer
Oura Ring 5 vs Oura Ring 4 (desk, 2026-09-19): Ring 5 is 6.09 × 2.28 mm, sizes 6–13, typically 6–9 days, ~3-day on-ring memory. Ring 4 is 7.9 × ~2.88 mm leftover titanium, sizes 4–15, typically 5–8 days, up to 7-day memory. Both use the same Oura Membership (US $5.99/mo or $69.99/year). Kits are generation-specific. From $399 US (Silver/Black) / $499 premium finishes on ouraring.com/store, 2026-09-19. From $349 US (Silver/Stealth) on ouraring.com/store, 2026-09-19; Gold listed $399–$499. Not a lab test.
The verdict
Oura Ring 5 for new buyers on this Oura line; Oura Ring 4 if the leftover size, finish, or dated ticket is the fit
Why: Same brand (Oura). Oura Ring 5 ranks newer/current on this line. Cells are OEM quotes dated 2026-09-19 / 2026-09-19 — not a lab winner for comfort, accuracy, or real-world battery. OEM fork is size run + shell volume + offline buffer — not a new membership product.
Buy Oura Ring 4 if
Buyers who need sizes 4–5 or 14–15, which Ring 5 does not sell.
Buy Oura Ring 5 if
Sleep- and recovery-first buyers who will pay Oura Membership and want the smallest current Oura.
Specs side by side
Same rows as the two named ring pages. Values are copied from those pages — if a cell is unpublished or contradictory on the manufacturer page, it already says so.
| Attribute | Oura Ring 4 | Oura Ring 5 |
|---|---|---|
| Materials | Titanium exterior and interior with PVD or DLC depending on finish; non-allergenic BPA-free titanium inner shellOura Ring 4 support | Full titanium exterior and interior; superhard PVD on all finishes; non-allergenic BPA-free titanium inner shellOura Ring 5 support (Discover Oura Ring 5) |
| Width | 7.9 mmOura Ring 4 support compare table | 6.09 mmOura Ring 5 support compare table; Introducing Ring 5 blog |
| Thickness | ~2.88 mm; recessed sensor dome 0.3 mmOura Ring 4 support | 2.28 mm; sensor dome height 0.7 mmOura Ring 5 support compare table |
| Weight | 3.3–5.2 g depending on size (titanium SKU)Oura Ring 4 support | From 2 grams (depending on ring size)ouraring.com/store/rings/oura-ring-5 |
| Sizes | 4–15 (Ring 4 sizing kit)Oura Ring 4 support | 6–13 (generation-specific sizing kit)Oura Ring 5 supportOura says Ring 5 sizing is slightly different from Ring 4. |
| Finishes | Store still listed Gold, Silver, Stealth on 2026-09-19; confirm live inventoryouraring.com/store | Black, Silver, Stealth, Brushed Silver, Gold, Deep RoseOura Ring 5 support; store |
| Battery (OEM) | Typically 5–8 daysOura Ring 4 supportOura: varies by size, settings, activity, battery age. | Typically 6–9 daysOura Ring 5 support; store product pageOura: results vary by size, settings, activity, and battery age. |
| Charging (OEM) | Typically 20–80 minutes depending on starting chargeOura Ring 4 support | About 80 minutes depending on battery level; size-specific standard charger + USB-C in the boxOura Ring 5 support; store “in the box” |
| Charging case (OEM) | Size-specific charging dock + USB cable in the box (General FAQs). Not a Ring 5 travel case.Oura General FAQs 2026-09-18; Use Your Oura Ring Charger | Every Oura set includes a size-specific charging dock + USB cable (power adapter not included). Optional Ring 5 Charging Case sold separately; Oura claims up to one month of battery and a full day of life in about 10 minutesGeneral FAQs 2026-09-18; Introducing Oura Ring 5 blog; store product page |
| Water resistance | 100 m / 328 ft. Ring 4 support: sauna and water sports, not diving. General FAQs / Product Safety (updated 2026-09-18): showering, swimming, recreational diving/snorkeling OK; not scuba; do not keep submerged over 12 hours.Oura Ring 4 support; General FAQs 2026-09-18; Product SafetyCite the page. Do not flatten “not diving” over the General FAQs recreational-diving sentence. | 100 m / 328 ft, IP68. Ring 5 support: sauna and water sports, not diving. General FAQs (updated 2026-09-18): showering, swimming, recreational diving/snorkeling OK; not scuba; do not keep submerged over 12 hours.Oura Ring 5 support; General FAQs 2026-09-18Cite the page. Do not flatten support “not diving” and FAQ “recreational diving” into one invented rule. |
| Sensors | Smart Sensing; 3 photodetectors + 2 triple LEDs (red, green, IR); digital temperature; accelerometerOura Ring 4 support | 2× triple LEDs (red, green, IR); 2× photodetectors; digital temperature; accelerometer. Blog also cites 12 signal pathways.Oura Ring 5 support; Introducing Ring 5 blog |
| Sleep tracking | Detailed sleep analysis with membership; nighttime SpO2 via red + IROura Ring 4 support | Detailed sleep analysis with membership; Blood Oxygen Sensing (SpO2) listedOura Ring 5 support; store footnotesOura’s 95% sleep-staging accuracy line is an OEM validation claim vs PSG — not our lab. |
| Activity / fitness | 24/7 HR; Automatic Activity Detection; dynamic activity goals (membership)Oura Ring 4 support | 24/7 heart rate (daytime, nighttime, activity); dynamic activity goals; Automatic Activity Detection (store: 40+ activities)Oura Ring 5 support; store |
| App | Oura AppOura Ring 4 support | Oura App (iOS / Android); 100+ integrations listed on the store pageouraring.com/store/rings/oura-ring-5; Set up the Oura App |
| Subscription / data access | Oura Membership (US $5.99/mo or $69.99/year; 1 complimentary month for new members). Same account rules as Ring 5.Oura Membership support; Ring 4 support | Oura Membership required for full app function. US $5.99/mo or $69.99/year; 1 complimentary month for new members. Account-tied, not ring-tied.Oura Membership support (updated 2026-09-08); ouraring.com/membershipWithout membership: three daily scores (Readiness, Activity, Sleep), battery, profile, settings, Explore. |
| Phone platforms | iOS 16+ or Android 11+ with Google Play; Bluetooth 5.0 phoneOura Set up the Oura App / General FAQs | iOS 16+ or Android 11+ with Google Play services; device must support Bluetooth 5.0Oura General FAQs / Set up the Oura App |
| Wireless | Bluetooth Low Energy (Bluetooth Smart); EMF-safe; Airplane Mode; FCC certifiedOura Ring 4 support | Bluetooth 5.0 / Bluetooth Low Energy; EMF-safe; Airplane Mode; FCC certifiedOura Ring 5 support; store |
| On-ring storage | Up to one week (seven days)Oura Ring 5 support compare table (Ring 4 column) | Up to three days of data storageOura Ring 5 support compare table |
| US price (dated) | From $349 (Silver/Stealth) on ouraring.com/store, 2026-09-19ouraring.com/store | From $399 (Silver, Black); $499 Gold, Deep Rose, Stealth, Brushed Silver — ouraring.com/store on 2026-09-19ouraring.com/storeGeo storefronts may show euros. Re-check the US shop on quote day. |
| Price band | Leftover flagship membership ringDerived from dated US store | Flagship membership ring ($399–$499 hardware + ongoing membership)Derived from dated US store + membership page |
| Announced | Previous current generation; support last updated 18 June 2026Oura Ring 4 support | 28 May 2026ouraring.com/blog/introducing-oura-ring-5/ |
| Availability | Still listed on the Oura store 2026-09-19; Oura says check store or authorized retailer for inventoryOura Ring 4 support; store | Current US SKU on ouraring.com/store (accessed 2026-09-19)Oura store |
Oura Ring 4 hub notes
- Widest current Oura size run: 4–15.
- Smart Sensing + recessed sensors; up to 7 days of onboard memory (vs 3 on Ring 5).
- Same membership feature list as Ring 5.
Ring 4 is the leftover Oura with the wide size run (4–15), 7.9 × ~2.88 mm titanium, typically 5–8 days, and the same paid membership app as Ring 5. Buy it for extreme sizes or leftover price. Skip it if you fit 6–13 and want the smaller Ring 5, or if you will not pay membership.
Oura Ring 5 hub notes
- Smallest current Oura: 6.09 mm wide, 2.28 mm thick, 40% less volume than Ring 4 (Oura).
- Typically 6–9 days and ~80 minute charge despite the smaller shell.
- Same membership feature list as Ring 4 (sleep, 24/7 HR, Stress, Heart Health, Women's Health, SpO2). Health Radar / Counsel Health / GLP-1 Insights are described as Gen3-and-newer software, not Ring-5-only scores.
Ring 5 is the smallest current Oura: 6.09 × 2.28 mm titanium, sizes 6–13, typically 6–9 days, same membership software family as Ring 4. Buy it if you fit 6–13 and will pay membership. Skip it if you need sizes 4–5 or 14–15 (still a Ring 4 run) or you refuse a subscription.
Sources
Union of the two hub source lists. Re-open the OEM URL, not this comparison, to refresh a cell.
- Oura Member Care — Oura Ring 4 — accessed 2026-09-19
- Oura store — accessed 2026-09-19
- Oura Member Care — Discover Oura Ring 5 (Ring 4 compare column) — accessed 2026-09-19
- Oura Member Care — Oura Membership — accessed 2026-09-19
- Oura Member Care — General FAQs — accessed 2026-09-19
- Oura Member Care — Product Safety & Use — accessed 2026-09-19
- Oura Member Care — Device Firmware Versions — accessed 2026-09-19
- Oura — Introducing Oura Ring 5 — accessed 2026-09-19
- Oura store — Ring 5 product page — accessed 2026-09-19
- Oura — Membership marketing page — accessed 2026-09-19
Frequently asked questions
Does Ring 5 keep Ring 4 sizes 4–5 and 14–15?
No. 6–13 (generation-specific sizing kit) Ring 4 still lists 4–15 (Ring 4 sizing kit).
Hub A: Oura Ring 4. Hub B: Oura Ring 5.