Spray Wall vs Moonboard: Which Should You Train On?

A board session is a board session until you have to pick a wall.

One of them lights up, has a global leaderboard, and lets you compare your 6C+ to someone in another country. The other is a mess of holds you chose yourself, no prescribed beta, and no one keeping score. Both get called "board training." They produce different climbers.

If you have to choose, choose on purpose. If you have both, stop treating them as interchangeable.

What you're actually comparing

A Moonboard is a standardised training board. 40 degrees overhanging. A fixed hold set (2016, 2017, 2019, 2024). LEDs that light a problem from an app. Benchmarks that thousands of people have tried. Your send is comparable, which is the whole point.

A spray wall (spray board, woody, home wall: same idea) is a wall with holds screwed on wherever someone decided they should go. No official problems. No lights. Angle is whatever the setter or the home-wall builder picked, often somewhere between 30 and 50 degrees, sometimes adjustable. You invent the climbing.

Kilter, Tension, Grasshopper and the rest sit closer to the Moonboard side of this: fixed holds, an app, a shared problem set. This piece is about the two ends of the spectrum, because that's the choice most people are actually making. For why a spray wall still beats the whole family of community boards on skill, see 3 Reasons Why Spray Boards Are Still The Best Training Tool.

What each one trains

The Moonboard trains repeatable hard movement on a known hold set. Crimping on small edges, at 40 degrees, on problems other people have already graded. You get strong in a very particular way, and you can prove it. Finger strength in weird positions, recruitment, tension, the "snappy" quality that route climbers usually lack. That's why Lee Cujes built a whole plan around smashing benchmarks: Moonboard Benchmark Buster.

The spray wall trains finding the climbing. You pick holds, you invent sequences, you fail, you change the beta. The holds can be slopers, volumes, jugs, pinches, whatever is on the wall this month. The angle can match the rock you're going to. The session looks messier and the progress is harder to screenshot. The transfer to actual rock is usually better, because rock does not light up the next hold.

Neither is "power endurance" or "max strength" by default. Those are how you use the wall, not properties of the wall. You can 4x4 on either. You can project one move on either. The wall decides the flavour of the climbing, not the energy system.

The differences that actually matter

Angle. Moonboard: 40 degrees, always. Spray: whatever you (or the gym) built. If your project is 20-degree granite, a 40-degree board is a strength tool, not a rehearsal. If your project is a steep cave, 40 degrees might be the more specific tool, and a vertical spray wall is the wrong one.

Holds. Moonboard holds are a closed set. You get very good at those holds. You do not get a dedicated sloper education, or a slab education, or whatever the current set is weak on. A spray wall can be reset, added to, or stripped for a trip. Fontainebleau prep on a Moonboard is a compromise. Fontainebleau prep on a spray wall with slopers on it is the actual work.

Problems. Moonboard problems exist before you arrive. Grade, beta videos, benchmarks, a queue of people who have done them. Spray wall problems exist when you make them. That is slower, and it is also the skill.

Measurement. Moonboard gives you a number you can track: this benchmark, this grade, this many in a session. Spray wall progress is "the link I couldn't do last month is now a warmup," which is real and annoying to log unless you bother. If you don't write spray sessions down, you will convince yourself you're improving when you're repeating the same six moves.

Social gravity. Moonboard sessions have a current. You open the app, you pick a benchmark, you try what everyone else is trying. That is motivating and it is also how you end up training someone else's weaknesses. Spray walls have no current. You can waste a session dithering. You can also train exactly the thing you came in for.

When the Moonboard is the right wall

Use it when you need a test, not a vibe.

You want to know if you got stronger. Benchmarks on a fixed set are one of the few honest tests indoor climbing has.
You're short on time or decision-making. Open the app, pick four problems, climb them.
You climb steep sport or steep boulders and 40 degrees is actually specific.
You like (or need) the social bit. Shared problems make it easier to show up.
You're running a block with a plan, not wandering. The Benchmark Buster plan exists because "I'll just have a go on the Moonboard" is not a program.

Do not use it as your only board work for months. You will get very good at Moonboard. That is a narrower adaptation than it feels like at the time.

When the spray wall is the right wall

Use it when the rock, or the skill, is the point.

You're preparing for a specific trip or style and can put the right holds on the wall. Slopers for Font. Pinches for a steep limestone cave. Pockets if that's what's waiting.
You need more than one angle. A single 40-degree board cannot cover a season that includes slabs and roofs.
Your limiter is reading sequences, not pulling small edges. Lights that show you the next hold are removing the thing you should be practising.
You have a home wall. Resetting a Moonboard isn't a thing. Resetting a spray wall is the whole advantage.
You already did your Moonboard block and the test numbers moved. Now you need the climbing to catch up.

If you have to pick one wall for the rest of your climbing life, pick the spray wall. I've written that before, and I still mean it. The Moonboard is the better test. The spray wall is the better training.

You can (and should) use both

They are not competing for the same slot in the week.

A simple split that works:

One Moonboard session in the week as the test / hard-repeatable work. Benchmarks, limit problems, a small number of attempts. Log the grade and the outcome.
One spray session as the skill / style work. Make problems, change beta, match the angle and holds to whatever you're building toward.

Not on consecutive days. Both are hard on fingers if you treat them as limit sessions, and stacking them is how a niggle becomes a layoff.

If you only have access to one, don't invent a reason to feel behind. Specificity beats variety you don't have. Just be honest about what that wall is not training, and fill the gap on rock or on a hangboard rather than pretending the board covers everything.

How people get this wrong

Treating them as the same session. "I did board work" is not a log entry. Which wall, which angle, which holds, what you tried. Otherwise you can't tell whether you got better at climbing or better at 40-degree crimps.
Moonboard as a personality. Six months of only benchmarks. Strong fingers, the same four movement patterns, and a rude surprise on rock that isn't 40 degrees with LEDs.
Spray wall with no intention. An hour of making up problems that all look like your favourite style. No notes. No repeat of last week's links. Feels creative. Isn't training.
Copying someone else's board diet. The strong local who lives on the Moonboard has a different limiter than you. Their volume is not a recommendation.
Skipping the log. Especially on spray. Moonboard at least has the app history. Spray has nothing unless you write the holds, the links, and what failed. Quantifying Bouldering is the longer version of this, and it applies here.

What to actually write down

For a Moonboard session: set (2016 / 2017 / 2019 / 2024), problems tried, grade, send or fail, number of attempts on the ones you care about.

For a spray session: angle, hold types you used, the problems or links you made, what you could do, what you couldn't. If the wall got reset, note that, or last month's notes become fiction.

Sequence will take both. The Moonboard session is easy to structure as a workout with the problems listed. The spray session is the one people skip logging, and it's the one that needs it more.

If the gym has both walls, the useful question is not "which is better." It's "what am I trying to change this block." Strength you can re-test: Moonboard. Movement and style for a trip: spray. Most seasons need a bit of each.

Pick one as the main course for a block, keep the other as a side, and stop mixing them into an unmeasurable stew called "board training."