DeWalt FlexVolt DCS578 Circular Saw vs Ryobi ONE+ HP PBLCS300 Circular Saw
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Quick take: The Ryobi ONE+ HP PBLCS300 Circular Saw costs $120 less bare; the Ryobi ONE+ HP PBLCS300 Circular Saw is lighter (7 vs 8.2 lbs); they live on different battery platforms (DeWalt 20V Max vs Ryobi ONE+), so the deciding factor is usually which batteries you already own.
| Spec | DeWalt FlexVolt DCS578 Circular Saw | Ryobi ONE+ HP PBLCS300 Circular Saw |
|---|---|---|
| Price (bare tool) | $249 | $129 |
| Kit Price | $549 | $199 |
| Rating | 4.7★ (1,976) | 4.7★ (1,934) |
| Category | Circular Saw | Circular Saw |
| Battery Platform | DeWalt 20V Max | Ryobi ONE+ |
| Voltage | 60V | 18V |
| Motor | Brushless | Brushless |
| Weight | 8.2 lbs (bare) | 7.0 lbs (bare) |
| Released | 2020 | 2021 |
| Blade | 7-1/4 in | 7-1/4 in |
| No-Load Speed | 5,800 RPM | 4,300 RPM |
| Max Cut Depth (90°) | 2-9/16 in | 2-7/16 in |
Pros & cons
DeWalt FlexVolt DCS578 Circular Saw
- ✓Rips LVL and wet PT lumber without bogging — owners consistently describe it as indistinguishable from a corded saw.
- ✓The 2-9/16 in cut depth clears 2x material at 45° where 18V-class saws come up short.
- ✓FlexVolt batteries back-feed the whole 20V Max ecosystem, so the big packs pull double duty.
- ✓Electric brake stops the blade fast enough to trust setting the saw down mid-rhythm.
- ✓The rafter hook and blade-left sightline get called out as framer-friendly details.
- ✓Deals routinely put the bare tool under $200, absurd value for the power class.
- ✗FlexVolt batteries are heavy and expensive — the saw is only as cordless as your budget for 9Ah+ packs.
- ✗At 8.2 lbs bare (more with the big pack) it out-weighs every 18V sidewinder here.
- ✗Overkill for trim and sheet-good work where a compact 20V saw is handier.
- ✗The kit at ~$549 is the most expensive way into this comparison.
- ✗No Tool Connect tracking on this model.
- ✗FlexVolt-only tools fragment the yellow lineup — this saw won't run on your regular 20V packs.
Ryobi ONE+ HP PBLCS300 Circular Saw
- ✓Cuts 2x material in a single pass at 90° and 45°, which cheaper 6-1/2 in saws cannot.
- ✓Tool Box Buzz and owners agree it handles OSB, decking, and stud work without drama on a 4Ah HP pack.
- ✓Uses standard 7-1/4 in blades from any brand, so a good Diablo blade transforms it.
- ✓At roughly half the price of pro saws it leaves budget for the batteries that actually determine cordless happiness.
- ✓The ONE+ ecosystem means the batteries work in 300+ other tools.
- ✓The electric brake — once a pro-only feature — made it down to this price point.
- ✗4,300 RPM is the slowest blade speed here; cut quality and feed rate trail the pro saws noticeably.
- ✗It bogs in wet PT and dense LVL where the FlexVolt and XGT saws power through.
- ✗The stamped-steel shoe flexes more than the magnesium bases upmarket, hurting long-cut accuracy.
- ✗No rafter hook.
- ✗Blade-right orientation with the handle geometry gives lefties and sightline-watchers trouble.
- ✗Under continuous heavy use owners report thermal shutdowns sooner than pro saws.